如何使用C#读取Excel文件的数据？

using OfficeOpenXml;
using System.IO;

public static List<List<string>> ReadExcelFile(string filePath)
{
    List<List<string>> data = new List<List<string>>();

    using (var package = new ExcelPackage(new FileInfo(filePath)))
    {
        var worksheet = package.Workbook.Worksheets[1];

        for (int row = worksheet.Dimension.Start.Row; row <= worksheet.Dimension.End.Row; row++)
        {
            List<string> rowData = new List<string>();

            for (int col = worksheet.Dimension.Start.Column; col <= worksheet.Dimension.End.Column; col++)
            {
                rowData.Add(worksheet.Cells[row, col].Value.ToString());
            }

            data.Add(rowData);
        }
    }

    return data;
}

string filePath = @"C:\path\to\your\excel\file.xlsx";
List<List<string>> data = ReadExcelFile(filePath);